Chater 47 & 51

Question 1

How long should you wait before you separate a model from the impression?

Answer 1

45-60 mins

Question 2

When pouring an impression where do you begin placing the gypsum material in a mandibular impression?

Answer 2

Posterior tooth to the right

Question 3

List the 2 parts of the dental model?

Answer 3

Art and Anatomic

Question 4

How are gypsum material mixed?

Answer 4

Bowl and spatula

Question 5

When mixing gypsum materials, how are the powder and water incorporated?

Answer 5

Powder to water

Question 6

How many types of gypsum products do we have in dentistry? Name them.

Answer 6

1. Dental plaster
2. Dental Stone
3. High strength stone

Question 7

What is another name for dental model?

Answer 7

Study cast

Question 8

What type of wax is used to form a wall around a preliminary impression when pouring it up?

Answer 8

Boxing wax

Question 9

Acrylic resin for the fabrication of trays is supplied as:

Answer 9

Liquid + powder

Question 10

What type of custom tray is made for a vital bleaching procedure?

Answer 10

Thermo plastic resin

Question 11

Of the three types of custom trays discussed which technique use a volatile hazardous material?

Answer 11

Acrylic resin tray

Question 12

What specialty practises might have a more expensive laboratory?

Answer 12

Ortho, prosthodontist, paediatrics

Question 13

Which would be an example of a contaminated item commonly found in the dental laboratory?

Answer 13

Impression

Question 14

What piece of equipment is used to grind away plaster or stone?

Answer 14

Dental model trimmer

Question 15

The size of a wax spatula most commonly used in the lab is a #____

Answer 15

7

Question 16

What piece of equipment does the dentist use to determine centric relation from a diagnostic model?

Answer 16

Articulator

Question 17

Which of the two models do you begin trimming first?

Answer 17

Maxillary

Question 18

What is the one specific area on a dental model where the maxillary and mandibular model is trimmed differently?

Answer 18

Anterior portion

Question 19

What should be placed between the two models when trimming them together?

Answer 19

Wax bite

Question 20

This material is a mixture of gypsum and water used in the finishing of models when voids are present:

Answer 20

Slurry

Question 21

To extend an impression tray what wax is used?

Answer 21

Utility wax

Question 22

What type of wax is used to get a patient’s bite?

Answer 22

Baseplate wax

Question 23

What is placed to prevent a tray from sitting too deeply onto the arch or quadrant?

Answer 23

Utility wax

Question 24

How are dental impressions cared for before they are taken to the dental lab?

Answer 24

Disinfected, washed off and labelled

Question 25

With Alginate impressions how long should you wait before pouring the impression?

Answer 25

Only 1 hour because it will dry out

Question 26

Four examples where dental models can be useful for dental procedures?

Answer 26

1. visual presentation of dental treatment
2. fixed or moveable prosthetic device
3. Orthodontics appliances
4. production of custom trays

Question 27

What is the main purpose of the vibrator?

Answer 27

To get rid of air bubbles

Question 28

How fast can your laboratory handpiece go?

Answer 28

20,000 RPM

Question 29

Your vacuum form can be used to do what type of dental product?

Answer 29

Bleaching tray and custom fluoride tray

Question 30

When would the use of the sandblaster be needed in the dental lab?

Answer 30

Crown and dentures

Question 31

How many methods of pouring do we have in dentistry? Name them

Answer 31

1. invert a poor
2. double pour
3. Box pour

Question 32

What is double pour?

Answer 32

Anatomic first, set new mix then art portion

Question 33

What is Inverted poor?

Answer 33

One mixture both anatomic + art

Question 34

What is a Box poor?

Answer 34

Make a small box and pour up

Question 35

What are five laboratory rules?

Answer 35

1- no eating or drinking 
2- wear all PPES 
3- hair up 
4-report all incidences
5- stays clean

Question 36

What type of procedures will be performed in a dental laboratory?

Answer 36

Making a dental model, trim and finish and custom tray

Question 37

What does the anatomical portion of the dental model consist of?

Answer 37

Teeth, oral mucosa, muscle attachment

Question 38

What should you do to your model before you start trimming?

Answer 38

Wet or soak

Question 39

When turning on your model trimmer what do you need to make sure you do before you start trimming?

Answer 39

Turn on water

Question 40

Which material is used to construct a custom tray?

Answer 40

Acrylic resin, thermaoplastic, light cured

Question 41

What do you do to prevent walking on a provisional restoration?

Answer 41

Vaseline

Question 42

What are the powder/water ratio of the 3 gypsum products?

Answer 42

Plaster – 100 g to 45-50 water
Regular stone – 100 g to 30-32 water
High stone – 100 g to 19-24 water

Question 43

Which type of chips and is commonly referred to as plaster of Paris?

Answer 43

Model plaster

Question 44

What type of inly wax is used for indirect wax patterns on dies?

Answer 44

Type B

Question 45

Which type of wax is used to cover orthodontic brackets?

Answer 45

Utility wax

Question 46

Another name for a dental model is?

Answer 46

Dental cast

Question 47

What dental material is used in the creation of a dental model?

Answer 47

Gypsum

Question 48

How was self-cured acrylic resin supplied for the fabrication of custom trays?

Answer 48

Powder and liquid

Question 49

What technique is used as a volatile hazardous material?

Answer 49

Acrylic resin